Li Qiong,Li Xuyong,Wu Ning,et al.Study on chromium-free sealing process of phosphating film[J].Plating & Finishing,2024,(1):91-96.[doi:10.3969/j.issn.1001-3849.2024.01.014]
磷化膜无铬封闭工艺研究
- Title:
- Study on chromium-free sealing process of phosphating film
- Keywords:
- phosphating film ; chromium-free ; sealing process ; polyacrylic resin
- 分类号:
- TG172.8
- 文献标志码:
- A
- 摘要:
- 针对磷化膜重铬酸填充的有毒有害问题，设计开发基于碱溶性聚丙烯酸树脂的无铬封闭液的配方及工艺，以点滴时间为评判指标，通过单因素实验考察了水性树脂种类、碱性助溶剂种类、硅溶胶含量、交联剂种类的影响，确定封闭液的主要组成为聚丙烯酸树脂 PAA 671 、氨水、硅溶胶、锆交联剂；利用正交试验考察了氨水、硅溶胶、锆交联剂的影响，结果显示硅溶胶含量为最重要因子，其次为锆交联剂。浓缩封闭液组成为 17.5 wt.% PAA 671 、 14 wt.% 中性硅溶胶、 14 wt.% 氨水、 0.14 wt.% 有机锆交联剂，余量为离子水，使用时按 2 ∶ 5 用去离子水稀释；封闭工艺为：试样在封闭液中浸泡 2 min ，然后在 70~85 ℃ 下烘干 15~30 min 。
- Abstract:
- ： Aiming at the toxic and harmful problem of dichromate filling in phosphating film ， the formula and process of chromium-free sealing solution based on the alkali-soluble polyacrylic resin were designed and developed. Taking the dropping time as the evaluation index ， the effects of the type of water-soluble resin ， the type of alkaline cosolvent ， the content of silica sol and the type of cross linker were investigated through the single-factor experiment. The main components of the sealing solution were determined to be PAA 671 resin ， ammonia ， silica sol and zirconium cross-linking agent. The influences of ammonia ， silica sol and zirconium cross-linking agents were investigated by orthogonal experiment. The results showed that the content of silica sol was the most important factor ， followed by the zirconium cross-linking agent. The concentrated sealing solution group was 17.5 wt.% PAA 671 ， 14 wt.% neutral silica sol ， 14 wt.% ammonia water ， 0.14 wt.% organic zirconium cross-linking agent ， and the rest was ionic water ， which was diluted with deionized water at a ratio of 2 ∶ 5. The sealing process was as follows ： the sample was soaked in the sealing liquid for 2 min ， and then dried at 70?85 ℃ for 15?30 min.
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备注/Memo
收稿日期： 2022-11-25 修回日期： 2023-05-31 作者简介： 李琼（ 1986 ―），女，硕士，高级工程师， email ： 419775952@qq.com * 通信作者： 王春霞（ 1975 ―），女，硕士，副教授， email ： wcx95@163.com?/html>